feat: Create directly without schema predefined

[yuanbohan]

What's changed and what's your intention?

Client and StreamClient can Create body directly into GreptimeDB without schema predefined.

	monitors := []monitor{
		{
			ID:          randomId(),
			Host:        "127.0.0.1",
			Memory:      1,
			Cpu:         1.0,
			Temperature: -1,
			Ts:          time1,
			Running:     true,
		},
		{
			ID:          randomId(),
			Host:        "127.0.0.2",
			Memory:      2,
			Cpu:         2.0,
			Temperature: -2,
			Ts:          time2,
			Running:     true,
		},
	}

	resp, err := client.Create(context.Background(), monitors)

Checklist

• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (34f2874) 77.62% compared to head (b7eaa45) 76.76%.

Files	Patch %	Lines
client/client.go	62.50%	2 Missing and 1 partial ⚠️
client/stream_client.go	62.50%	2 Missing and 1 partial ⚠️
schema/schema.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   77.62%   76.76%   -0.87%     
==========================================
  Files           7        7              
  Lines         371      383      +12     
==========================================
+ Hits          288      294       +6     
- Misses         63       67       +4     
- Partials       20       22       +2     

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[github-actions]

license-eye has totally checked 35 files.

Valid	Invalid	Ignored	Fixed
22	2	11	0

Click to see the invalid file list

• examples/schema/main.go
• examples/tag/main.go